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日本方头甲捕食桑盾蚧量与桑盾蚧成虫和其初孵若虫密度呈负加速曲线关系,属于HollingⅡ型的功能反应。日本方头甲成虫捕食桑盾蚧成虫功能反应式为:Na=1.2329N/(1+0.1015N);捕食桑盾蚧初孵若虫的功能反应式为:Na=1.0709N/(1+0.0042N),其最大捕食理论值分别为1215头和25667头。
It is a functional response of Holling type Ⅱ that the amount of Japanese squarfish preying on mulberry and the density of newly hatched nymphs of S. mongolian showed a negative acceleration curve. The functional response of adults of S. crassa to feeding on mulberry mulberry was Na = 1.2329N / (1 + 0.1015N). The functional response of newly hatched nymphs in S. crassa was Na = 1.0709N / (1 + 0.0042N ), Its maximum predation theoretical value is 1215 and 25667 respectively.